package com.example.ali.activity;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.example.ali.R;
import com.example.ali.adapter.StartAdapter;

import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

public class StartActivity  extends AppCompatActivity implements ViewPager.OnPageChangeListener   {
    private ViewPager vp;
    private int []imageIdArray;//图片资源的数组
    private List<View> viewList;//图片资源的集合
    private ViewGroup vg;//放置圆点

    //实例化原点View
    private ImageView iv_point;
    private ImageView []ivPointArray;

    //最后一页的按钮
    private Button ib_start;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_start);

        ib_start = (Button) findViewById(R.id.guide_ib_start);
        ib_start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(StartActivity.this,MainActivity.class));
                finish();
            }
        });

        //加载ViewPager
        initViewPager();

        //加载底部圆点
        initPoint();
    }

    /**
     * 加载底部圆点
     */
    private void initPoint() {
        //这里实例化LinearLayout
        vg = (ViewGroup) findViewById(R.id.guide_ll_point);
        //根据ViewPager的item数量实例化数组
        ivPointArray = new ImageView[viewList.size()];
        //循环新建底部圆点ImageView，将生成的ImageView保存到数组中

        for (int i = 0;i<viewList.size();i++){
            iv_point = new ImageView(this);
            LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(10, 10);
            lp.setMargins(10, 0, 10, 0);
            iv_point.setLayoutParams(lp);

            iv_point.setPadding(10,0,10,0);//left,top,right,bottom
            ivPointArray[i] = iv_point;
            //第一个页面需要设置为选中状态，这里采用两张不同的图片
            if (i == 0){
                iv_point.setBackgroundResource(R.drawable.banner_unselect);

            }else{
                iv_point.setBackgroundResource(R.drawable.banner_select);
            }
            //将数组中的ImageView加入到ViewGroup
            vg.addView(ivPointArray[i]);
        }



    }

    /**
     * 加载图片ViewPager
     */
    private void initViewPager() {
        vp = (ViewPager) findViewById(R.id.guide_vp);
        imageIdArray = new int[]{R.mipmap.guide1,R.mipmap.guide2};
        viewList = new ArrayList<>();

        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);

        //循环创建View并加入到集合中
        int len = imageIdArray.length;
        for (int i = 0;i<len;i++){
            //new ImageView并设置全屏和图片资源
            ImageView imageView = new ImageView(this);
            imageView.setLayoutParams(params);
            imageView.setBackgroundResource(imageIdArray[i]);

            //将ImageView加入到集合中
            viewList.add(imageView);
        }

        //View集合初始化好后，设置Adapter
        vp.setAdapter(new StartAdapter(viewList));
        //设置滑动监听
        vp.setOnPageChangeListener(this);
    }


    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

    }

    /**
     * 滑动后的监听
     * @param position
     */
    @Override
    public void onPageSelected(int position) {
        //循环设置当前页的标记图
        int length = imageIdArray.length;
        for (int i = 0;i<length;i++){
            ivPointArray[position].setBackgroundResource(R.drawable.banner_unselect);
            if (position != i){
                ivPointArray[i].setBackgroundResource(R.drawable.banner_select);
            }
        }

        //判断是否是最后一页，若是则显示按钮
        if (position == imageIdArray.length - 1){
            ib_start.setVisibility(View.VISIBLE);
            TimerTask task = new TimerTask() {
                @Override
                public void run() {
                    startActivity(new Intent(StartActivity.this,MainActivity.class));
                  finish();
                }
            };
            Timer timer = new Timer();
            timer.schedule(task, 2000);

        }else {
            ib_start.setVisibility(View.GONE);
        }
    }


    @Override
    public void onPageScrollStateChanged(int state) {

    }
}
